These git bash utility scripts will execute git ops on a specific date, and change/update the Author & Commiter Name and Email for all commits in a workdir

!useful git scripts.md

Useful Git scripts

These git bash utility scripts will:

• execute add and commit git operations on a specific date rather than the current time/date right now
• change the Author & Commiter Name and Email for all commits in a workdir
• update the Author & Commiter Name currently in use in gitconfig

git-change-author.sh

# This script will take all commits and change the Author Name and Email and
# Commiter Name and Email to a new value
# This example came from:
# http://stackoverflow.com/questions/750172/how-do-i-change-the-author-of-a-commit-in-git

if [ $# == 0 ] ; then 
  echo "This script requires 2 parameters, and in double-quotes if they contain spaces, eg.:"
  echo "  * Author Name"
  echo "  * Author Email"
fi

Newname=$1
Newemail=$2

#git filter-branch -f --env-filter "GIT_AUTHOR_NAME='$Newname';
#GIT_AUTHOR_EMAIL='$Newemail'; GIT_COMMITTER_NAME='$Newname';
#GIT_COMMITTER_EMAIL='$Newemail';" HEAD


#With linebreaks in the string (which is possible in bash):

git filter-branch -f --env-filter "
    GIT_AUTHOR_NAME='$Newname'
    GIT_AUTHOR_EMAIL='$Newemail'
    GIT_COMMITTER_NAME='$Newname'
    GIT_COMMITTER_EMAIL='$Newemail'
" HEAD

git-op-by-date.sh

#!/bin/bash

# This script executes a git operation using the file modification date
# (retrieved by the stat command) described by this wiki page:
# https://github.com/syntechdev/powerpanel/wiki/FunWithGitAndGithub#git-commits-using-file-mod-dates

# Unfortunately stat has different syntax on the Mac and on Linux (Grrr!) so to get a file date:
# On a Mac system execute:
#   stat -f "%Sm" sql/parsed-payload-tracker.sql
# On a linux system execute:
#   stat -c "%y" sql/parsed-payload-tracker.sql

# enable for debugging to echo commands as run
set -x

# extended pattern matching
shopt -s extglob


if [ $# -le 1 ] ; then
  echo "This script requires at least 3 parameters, with double-quotes used if they contain spaces; and can take a 3rd param as the git add file list or the git commit message:"
  echo "  * Param 1: Git operation (add|mv|commit)"
  echo "  * Param 2: File to use to get date-time source"
  echo "  * Param 3: File(s) or directory to pass to the git command op (only one param works currently)"
  echo "        OR   Git commit message (must be in quotes if it includes spaces)"
  exit
fi

gitop=$1
statfile=$2

platform='unknown'
platform=`uname`
#echo "uname result: ** $platform **"

#if [[ "$platform" == "Darwin" ]]; then
case "$platform" in
  "Darwin")
    statcmd="stat -f %Sm $statfile"
  ;;
  "Linux")
    #elif [[ "$platform" == "Linux" ]]; then
    statcmd="stat -c %y $statfile"
  ;;      
  #else  
  *)    
    # Unknown platform
    echo "Uname returned an unexpected result so can't identify platform"
    exit
  ;;
esac
#fi 

#echo "$statcmd"
statdatetime=$($statcmd)
echo "File $statfile datetime reported by stat: $statdatetime"
#gitfiles=${3:-$statfile}
#gitmessage=${@:4}

#if [[ "$gitop" == ("add"|"mv") ]] ; then 
case "$gitop" in  
  +("add"|"mv"))                # gitop matches add or mv
      # Add the files in the sql/ sub-directory
      gitfiles=${@:3}
      echo "*** $gitfiles ***"
      #GIT_AUTHOR_DATE="`stat -f "%Sm" sql/parsed-payload-tracker.sql`" GIT_COMMITTER_DATE="`stat -f "%Sm" sql/parsed-payload-tracker.sql`" git $gitop sql/
    #  echo GIT_AUTHOR_DATE="$statdatetime" GIT_COMMITTER_DATE="$statdatetime" git $gitop $gitfiles
      GIT_AUTHOR_DATE="$statdatetime" GIT_COMMITTER_DATE="$statdatetime" git $gitop $gitfiles

      # Confirm that the correct files are staged for commit
      git status
  ;;  
  #elif [[ "$gitop" == "commit" ]] ; then
  "commit")             # gitop matches commit
      # Commit the files in the sql/ sub-directory
      gitmessage=${@:3}
      echo "*** $gitmessage ***"
      # GIT_AUTHOR_DATE="`stat -f "%Sm" sql/parsed-payload-tracker.sql`" GIT_COMMITTER_DATE="`stat -f "%Sm" sql/parsed-payload-tracker.sql`" \ 
      #   git commit -m "Committing sql parsing files created in January 2014, prior to committing other changes"
    #  echo GIT_AUTHOR_DATE="$statdatetime" GIT_COMMITTER_DATE="$statdatetime" git commit -m $gitmessage
      GIT_AUTHOR_DATE="$statdatetime" GIT_COMMITTER_DATE="$statdatetime" git commit -m "$gitmessage"
  ;;  
  #else
  *)  
      echo "You entered [ $gitop ] as the Git operation but it was not recognized"
  ;;  
esac
#fi

git-update-cfg.sh

# This script will reset the git config user.name and user.email config
# varaibles so they are used for git commits as Author Name and Email and
# Commiter Name and Email
# This script is loosely based on ~/git-change-author.sh

if [ $# == 0 ] ; then 
  echo "This script requires at least 3 parameters, with use double-quotes if
  they contain spaces; and can take a 4th param to control the git config scope eg.:"
  echo "  * Author Name"
  echo "  * Author-Email"
  echo "  * Github-Username"
  echo "  * Github-Scope (local|system|global)"
else

  Newname=$1
  Newemail=$2
  Newgituser=$3
  Gitscope=${4:-system}

  echo "*** Git config parameters before update: ***"
  # git config --get-regexp user.[ne]*
  git config --get-regexp user*
  
  echo "----------"

  echo "*** Updating Git config parameters ... ***"
  git config --${Gitscope} --replace-all user.name "$Newname"
  git config --${Gitscope} --replace-all user.email $Newemail
  git config --${Gitscope} --replace-all github.user $Newgituser

  echo "----------"

  echo "*** Git config parameters after update: ***"
  # git config --get-regexp user.[ne]*
  git config --get-regexp user*

fi